Noise reduction fairing

a technology of noise reduction and fairing, applied in the direction of mechanical equipment, transportation and packaging, aircraft braking arrangements, etc., can solve the problems of significant noise generation, noise generation, and noise generated by landing gear

Active Publication Date: 2019-10-31
MESSIER DOWTY
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention is a noise reduction fairing for vehicles that reduces the noise caused by airflow over the bra lifetime wear indicator system. It uses a coating that changes color to indicate temperature, which helps with maintenance inspections and actions. The fairing takes up minimal space and provides effective noise reduction.

Problems solved by technology

it is known that the aircraft landing gear are a significant source of noise during take-off and in particular during the landing phases (the approach, intermediate and final phases).
This noise is generated by the turbulent airflow passing over and through the constituent elements of the landing gear when the landing gear is down.
A significant portion of the landing gear generated noise is accounted for by the brakes, as a result of their complex geometry.
However, a result of deflecting the airflow is that the airflow is accelerated over the fairing.
When this accelerated airflow strikes other solid surfaces of the landing gear located downstream of the fairing this in turn generates further noise.
This acceleration of the airflow and therefore potential increase in noise arising from further elements of aircraft landing gear therefore potentially achieves the opposite of the desired effect of the fairing.
However, in practice the perforations and mesh areas become blocked, for example with dust or other small debris, and therefore do not allow the airflow to pass through as intended.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Noise reduction fairing
  • Noise reduction fairing
  • Noise reduction fairing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0029]FIGS. 1-3 illustrate a portion of a landing gear assembly according to an embodiment of the present invention. The landing gear assembly includes a support strut 100 having an axle 101 rotationally mounted thereto. The axle 101 is arranged to have a pair of wheels 103 (only one wheel is illustrated in FIGS. 1 and 2 for the sake of clarity) mounted to the axle. FIGS. 1-3 illustrate a single axle landing gear but it will be appreciated that embodiments of the present invention also apply to landing gear assemblies having multiple axles mounted to a bogie beam.

[0030]The shock strut 100 includes a pair of brake flanges 102 to which respective brake assemblies 118 are arranged to be fastened to. Each brake assembly may be of any known construction but generally comprises a number of first brake discs mounted to the wheel 103 or axle 101 and a corresponding number of second brake discs mounted to the brake flange and interposed between the first set of discs, together with a number ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

An aircraft landing gear assembly including a plurality of noise-inducing elements, at least one of the noise-inducing elements comprising a brake assembly or electric drive assembly, and a noise reduction fairing arranged to shield only at least a portion of the brake assembly from incident airflow.

Description

BACKGROUND OF THE INVENTION[0001]it is known that the aircraft landing gear are a significant source of noise during take-off and in particular during the landing phases (the approach, intermediate and final phases). This noise is generated by the turbulent airflow passing over and through the constituent elements of the landing gear when the landing gear is down. The turbulence is generated largely as a result of not all of the landing gear elements having an aerodynamic outer shape, or envelope. A significant portion of the landing gear generated noise is accounted for by the brakes, as a result of their complex geometry.[0002]Existing solutions to this problem include providing one single large-size fairing on the landing gear that covers the entire area between the wheels, brakes and torque links, the fairing being designed to deflect the airflow both around the brakes and other adjacent components of the landing gear. However, a result of deflecting the airflow is that the airf...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): B64C25/00B64C25/10B60B27/00F16D65/00
CPCB64C2025/003B64C25/001F16D65/0006B60B2900/133B60B27/0047B64C25/10B64C25/16B64C25/42
InventorMANSFIELD, RICKY PETER
OwnerMESSIER DOWTY